Newsela, a personalized learning platform for literacy, has raised $15 million in a Series B round of funding led by Kleiner Perkins Caufield & Byers with participation of Mark Zuckerberg, Priscilla Chan, Women's Venture Capital Fund, the John S. and James L. Knight Foundation, and Owl Ventures. Newsela is reportedly being used by 70 percent of all U.S. public schools.